Talk detail

Participant	Wang, Yu
Institution	Dipartimento di Fisica, Sapienza Università di Roma - P.le A. Moro, 5 - Roma - Lazio - Italy

Session	GRB2	Accepted		Order	Time
Talk	Oral abstract	Title	Absence of high-energy neutrinos in the GRB models
Co-authors
Abstract	Based on the GRB fireball model, Bachall, Vietri and Waxmann assumed that UHECR and GRBs have the same origin. They considered the Fermi mechanism in the presence of strong magnetic fields to produce high-energy protons UHECR, then a large flux of high-energy neutrinos is expected through $p+\gamma\rightarrow n+\pi^+$ et. This predicted neutrino flux has not been observed by the Ice-Cube. Here we briefly review and discuss high energy neutrinos production from the GRB fireshell model in comparison with the GRB fireball model. Indeed in the fireshell model, the acceleration phase originates in an optically thick electron positron plasma and reachs transparency in the P-GRB, no magnetic fields and internal shocks are present. The maximum energy of protons is simply given by $\Gamma$ Lorentz Factor times proton mass $E_p^{max}\simeq\Gamma m_{p}<10^{3}$GeV. The interaction of the accelerated protons with photons with energy $E_\gamma < 1$ MeV can produce neutrinos of energies $100-1000$ GeV, and the expected flux of the neutrinos from one single GRB is given by an example of GRB 101023. Also by considering the redshift and energy distributions of GRBs, we estimate the total neutrino flux that can be observed in one year.